Apparently when our LDAP servers are under a bit of load such as when we do a batch update of info and the indexing is slowing things down, our postfix mailserver rejects email saying “status=bounced (unknown user: “username”)”. Which sucks because the person who sent the email will get that bounce message back. In an attempt to fix this problem we have put an ldap replica on our mailserver and told postfix to look there first. We have also changed the lines in our postfix config file to list multiple ldap servers like so:
ldapalias_server_host = localhost ldap.gac.edu ldap1.gac.edu ldap2.gac.edu ldap3.gac.edu
And like:
server_host = localhost ldap.gac.edu ldap1.gac.edu ldap2.gac.edu ldap3.gac.edu
I really hope that helps us.
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